Important Notice: 1. Automatic ventilation of greenhouse can not be used at temperatures above 50 (122 F)<br> 2. Make that your greenhouse window opens normally<br> Specifications: Maximum height of the window opening about 45cm<br> The temperature of complete opening about 30 (depending on adjustment and load)<br> Maximum weight not more than 7kg/15lb, Opening temperature regulated 16 to 25<br> Note<br> When you receive this item in summer, you need to put the black bar into the refrigerator not less than 5 minutes to make the cylinder retracted fully before you assembly this product.<br> Color: Black & Silver<br> Material: aluminium alloy<br> Package Contents:<br> 1 x Automatic Window Opener kit<br> Only the above package content, other products are not included.<br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.